As a matter of fact, we do know why you’re getting a Type 
Mismatch error, and it’s a common problem when working with 
the WMI class Win32_NetworkAdapterConfiguration. The line 
in your script that’s causing the problem most likely looks 
something like this:
Wscript.Echo "IP Address: " & objItem.IPAddress

So what’s the problem? Well, the IPAddress property is 
actually stored as an array; that’s because it’s possible 
for multiple IP addresses to be assigned to a single 
network adapter. You’re treating IPAddress as though it was 
a string or numeric variable and it’s not; an array is a 
totally different datatype. Hence the Type Mismatch error.